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I'd have to disagree on the very last point about major site changes taking at least a month.

I've completely redesigned sites, and had clients redesign sites and see indexing and recacheing of changes go from 30 days to 2-3 days. This is comparing minor things like title tag and content tweaks on low-traffic sites. To boot there is a Google Webmaster Help video that talks about how Google determines caching schedule based on the significance of change in code.